Dual polarized ambidextrous multiple deformed aperture spiral antennas
First Claim
1. An antenna group occupying a substantially circular area, comprising a plurality of spiral antenna disposed adjacent one another, radially symmetrically arranged about the centerpoint of the circular area, each spiral antenna comprising a pair of windings arranged in a spaced, interleaved configuration, each winding having a feed point at a first end of the spiral antenna, each spiral antenna being symmetrically deformed to occupy the area within a sector of the circular area such that the length of each winding of each antenna measured from a second end of the spiral antenna remote from the feed points in a direction along said winding from said second end toward said first end to the point where the winding first intersects a radius extending from said second end to a midpoint between each windings feed points is not less than 0.75 times the circumference of the circular area, the windings being arranged to yield a stable phase center located at said midpoint, wherein the windings of at lest one of the spiral antennas are generally Archimedean spirals in the vicinity of the feed points of the spiral antenna and generally logarithmic sprials in the vicinity of said second end of the spiral antenna.
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Abstract
An antenna group comprising a plurality of spiral antennas occupies a circular space. The spiral antennas are radially symmetrically arranged about a point at the center of the circle. Each spiral antenna is deformed to occupy a substantially all of the area within a sector of the circle. The antenna may be used for detection of circularly-polarized waves of either polarization sense, or may operate with phase-sensing means to locate the source of incoming electromagnetic radiation.
43 Citations
17 Claims
- 1. An antenna group occupying a substantially circular area, comprising a plurality of spiral antenna disposed adjacent one another, radially symmetrically arranged about the centerpoint of the circular area, each spiral antenna comprising a pair of windings arranged in a spaced, interleaved configuration, each winding having a feed point at a first end of the spiral antenna, each spiral antenna being symmetrically deformed to occupy the area within a sector of the circular area such that the length of each winding of each antenna measured from a second end of the spiral antenna remote from the feed points in a direction along said winding from said second end toward said first end to the point where the winding first intersects a radius extending from said second end to a midpoint between each windings feed points is not less than 0.75 times the circumference of the circular area, the windings being arranged to yield a stable phase center located at said midpoint, wherein the windings of at lest one of the spiral antennas are generally Archimedean spirals in the vicinity of the feed points of the spiral antenna and generally logarithmic sprials in the vicinity of said second end of the spiral antenna.
- 8. An antenna group having two separate symmetrically deformed spiral antennas, each spiral antenna comprising a pair of windings arranged in a spaced, interleaved configuration, each winding having a feed point at a first end of the spiral antenna, the windings of each antenna being arranged to yield a stable phase center located at a midpoint between each winding'"'"'s feed point, said antennas being disposed adjacent and co-planar with one another within a circular area, each spiral antenna being symmetrically deformed to occupy the area within a sector of the circular area such that the length of each winding of each antenna measured from a second end of the spiral antenna remote from the feed point in a direction along said winding from said second end toward said first end to the point where the winding first intersects a radius extending from said seconded to said midpoint is not less than 0.75 times the circumference of the circular area, wherein the windings of at least one of the spiral antennas are generally Archimedean spirals in the vicinity of the feed points of the spiral antenna and logarithmic spirals in the vicinity of a second end of the spiral antenna remote from the feed points.
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16. An antenna group occupying a substantially circular area, comprising a plurality of spiral antennas disposed adjacent to one another, radially symmetrically arranged abut the center point of the circular area, each spiral antenna comprising a pair of windings arranged in a spaced, interleaved configuration, each winding having a feed point at a first end of the spiral antenna, each spiral antenna being symmetrically deformed to occupy the area within a sector of the circular area such that the length of each winding of each antenna measured from a second end of the spiral antenna remote from the feed point in a direction along said winding from said second end toward said first end to the point where the winding first intersects a radius extending from said second end to a midpoint between each winding'"'"'s feed points is not less than 0.75 times the circumference of the circular area, at least one of the spiral antennas being a generally Archimedean spiral in the vicinity of the feed points of the spiral antenna and a generally logarithmic spiral in the vicinity of a second end of the spiral antenna remote from the feed points, said pair of windings of each antenna being arranged to yield a stable phase center located at said midpoint.
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17. An antenna group having two separate symmetrically deformed spiral antennas, each spiral antenna comprising a pair of windings arranged in a spaced, interleaved configuration, each winding having a feed point at a first end of the spiral antenna, the windings of each antenna being arranged to yield a stable phase center located at a midpoint between each winding'"'"'s feed point, said antennas being disposed within a circular outline, one of the antennas being disposed in a plane different from the plane of the other antenna, each spiral antenna being symmetrically deformed to occupy the area within a sector of the circular area such that the length of each winding of each antenna measured from a second end of the spiral antenna remote from the feed points in a direction along said winding from said second end toward said first end to the point where the winding first intersects a radius extending from said second end to said midpoint is not less than 0.75 times the circumference of the circular area, wherein the windings of at least one of the spiral antennas are generally Archimedean spirals in the vicinity of the feed points of the spiral antenna and logarithmic spirals in the vicinity of a second end of the spiral antenna remote from the feed points.
Specification